1) what is Archimedes principle? 2) why can a helium filled balloon float? 3) Is
ID: 2268874 • Letter: 1
Question
1) what is Archimedes principle? 2) why can a helium filled balloon float? 3) Is the buoyant force always directed upward? 4) for a swimmer, is it easier to float in salt water or fresh water? 5) a fully loaded canoe weighs 450 lb. what is the buoyant force on the canoe? 6) a large rock has a volume of 3 cubic feet. when it is submerged in the ocean what is the buoyant force on it ? 7) what is the melting point of aluminum in Celsius and Fahrenheit? 8) aluminum has a specific heat of 0.22 cal /g C. how many calories of heat energy are needed to raise the temperature on one gram of aluminum by 5 C? 9) convert - 40 F to Celsius 10) If a piece of cake has 125 calories, what does this mean?Explanation / Answer
1. Archimedes’ principle states that any body completely or partially submerged in a fluid (gas or liquid) at rest is acted upon by an upward force with magnitude equal to the weight of the fluid displaced by the body. The volume of displaced fluid is equivalent to the volume of an object fully immersed in a fluid or to that fraction of the volume below the surface for an object partially submerged in a liquid. This principle explains the floating of ship and sinking of iron ball.
2. A baloon filled with Helium is lighter than the air and goes up due to the buoyant force. The buoyant upward force becomes higher than the gravitational force on the baloon.
3. No, the buoyant is not always directed upward. Rather, it is directed against the pressure gradient, that is in the direction that the pressure decreases.
4. In ocean water, dissolved salt adds mass to the water and makes the water denser than the fresh water. Because objects float better on a dense surface, it is easier for swimmer to float in salt water.
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